منابع مشابه
Nucleosome occupancy landscape and dynamics at mouse recombination hotspots.
During meiosis, paternal and maternal homologous chromosomes recombine at specific recombination sites named hotspots. What renders 2% of the mammalian genomes permissive to meiotic recombination by allowing Spo11 endonuclease to initiate double-strand breaks is largely unknown. Work in yeast has shown that chromatin accessibility seems to be important for this activity. Here, we define nucleos...
متن کاملGenomic features shaping the landscape of meiotic double-strand-break hotspots in maize.
Meiotic recombination is the most important source of genetic variation in higher eukaryotes. It is initiated by formation of double-strand breaks (DSBs) in chromosomal DNA in early meiotic prophase. The DSBs are subsequently repaired, resulting in crossovers (COs) and noncrossovers (NCOs). Recombination events are not distributed evenly along chromosomes but cluster at recombination hotspots. ...
متن کاملCOMMUNITY ECOLOGY - METHODS PAPER Grasses and browsers reinforce landscape heterogeneity by excluding trees from ecosystem hotspots
Spatial heterogeneity in woody cover affects biodiversity and ecosystem function, and may be particularly influential in savanna ecosystems. Browsing and interactions with herbaceous plants can create and maintain heterogeneity in woody cover, but the relative importance of these drivers remains unclear, especially when considered across multiple edaphic contexts. In African savannas, abandoned...
متن کاملLandscape-scale analyses suggest both nutrient and antipredator advantages to Serengeti herbivore hotspots.
Mechanistic explanations of herbivore spatial distribution have focused largely on either resource-related (bottom-up) or predation-related (top-down) factors. We studied direct and indirect influences on the spatial distributions of Serengeti herbivore hotspots, defined as temporally stable areas inhabited by mixed herds of resident grazers. Remote sensing and variation in landscape features w...
متن کاملWarfare in biodiversity hotspots.
Conservation efforts are only as sustainable as the social and political context within which they take place. The weakening or collapse of sociopolitical frameworks during wartime can lead to habitat destruction and the erosion of conservation policies, but in some cases, may also confer ecological benefits through altered settlement patterns and reduced resource exploitation. Over 90% of the ...
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ژورنال
عنوان ژورنال: Acta geographica Slovenica
سال: 2013
ISSN: 1581-6613
DOI: 10.3986/ags53106